Synkinematic emplacement of the Pan-African Ngondo igneous complex (west Cameroon,central Africa) |
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| Institution: | 1. Faculty of Animal Sciences, Universidad de Ciencias Aplicadas y Ambientales, U.D.C.A, Calle 222 # 55 – 37, Bogotá, Colombia;2. Department of Animal Pathology, Faculty of Veterinary Sciences, University of Zaragoza, Miguel Servet 177, Zaragoza, Spain;3. Faculty of Health, Universidad de Ciencias Aplicadas y Ambientales, U.D.C.A, Calle 222 # 55 – 37, Bogotá, Colombia;4. Department of Pediatrics, Faculty of Health, Universidad del Valle, Calle 13 No. 100 – 00, Cali, Colombia;5. Agrifood Institute of Aragon (IA2), University of Zaragoza-CITA, Miguel Servet 177, 50013 Zaragoza, Spain |
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| Abstract: | The Ngondo Complex is one of the Pan-African plutons intruded in the West Cameroon Pan-African Orogenic Belt. The complex consists of three major groups of rocks: basic to intermediate rocks (diorites, granodiorites and minor gabbros), fined-grained granites and coarsed-grained granites successively emplaced in a metamorphic country rock of amphibolite-facies. Synkinematic emplacement of the complex, in relation with a ductile mega shear zone, is documented by a study of microstructures and foliation patterns which indicate a continuous transition from magmatic to high temperature solid-state deformation. The geometry of the internal foliation trajectories and the joint orientation in the complex suggest that the emplacement of the three groups of rocks was totally controlled by a N30° sinistral shear zone. Emplacement mechanisms, which are related in time and space to a continuum of deformation, may indicate a relative rheological change of the crust from ductile to brittle behaviour. |
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